Which change best explains how long-standing hypertension contributes to chronic kidney disease progression?

• A. Atheroembolism to the kidney
• B. Hyaline arteriolosclerosis narrowing afferent arterioles
• C. Glomerular immune complex deposition
• D. Acute tubular necrosis due to ischemia

Answer: (B)

Long-standing hypertension damages the small vessels in the kidney, leading to hyaline arteriolosclerosis of the arterioles. The arteriolar walls thicken and the lumens narrow due to leakage of plasma components and increased matrix production in smooth muscle, most notably in the afferent arterioles. This reduces blood flow into the glomeruli, causing chronic ischemia that promotes glomerulosclerosis and interstitial fibrosis, a cycle that drives gradual loss of renal function in hypertensive nephrosclerosis. The renin-angiotensin system is often activated, worsening hypertension and vascular injury. Other options describe different processes (embolic obstruction, immune complex glomerulonephritis, or acute tubular necrosis) that don’t explain the chronic vascular remodeling behind hypertensive CKD progression.